Port 9596Mercury Discovery

Port 9596 is assigned to Mercury Discovery, but no widely used listener or protocol behavior is established.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

Technical Details

what runs on :9596

Mercury Discovery is registered on port :9596 over tcp and udp to Paul Mclachlan, assigned November 2005. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :9596

this machine

# linux
sudo ss -tulpn 'sport = :9596'

# macos / bsd
sudo lsof -nP -i :9596

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :9596

another host

nmap -sV -p T:9596 <host>
sudo nmap -sU -sV -p U:9596 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :9596

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :9596 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :9596
service: Mercury Discovery
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns TCP and UDP port 9596 to Mercury Discovery, registered to Paul Mclachlan. It is not commonly observed open in internet-wide scans, and no widely deployed implementation is established.
lookups: 0rank 993
added: 2026-10-15
updated: 2026-10-15
references: IANA service name registry — port 9596

Something wrong?

This record is maintained by the engineers who use port 9596. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-15.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :9596, by lookups.

port	service	proto	category	risk	views
:9600	Omron FINS Communication	UDP	Network Services	caution	33.2k
:9535	LANDesk Remote Control	TCPUDP	Remote Access	caution	11.1k
:9561	Network Time System	TCPUDP	Network Services	safe	8.3k
:9536	IP Fabrics Buffering	TCPUDP	Security	caution	4.4k
:9594	Message System	TCPUDP	—	safe	0
:9618	HTCondor Collector	TCPUDP	Network Services	caution	0
:9599	Robix	TCPUDP	—	safe	0
:9595	Ping Discovery Service	TCPUDP	Network Services	safe	0

risk mix of the 8 listed

safe50%
caution50%

0 of 8 encrypted

Port :9596Mercury Discovery

Technical Details

Security Information

Related Ports

Port 9596Mercury Discovery